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Highly-condensed thin films of Cu2FeSnS4 (CFTS) nanoparticles are prepared on FTO substrates by spin-coating CFTS precursor solution followed by a short thermal annealing at low temperature for the first time. The CFTS film has a band gap of 1.53 eV and an absorption coefficient higher than 104 cm−1 in the wavelength range of 300–1100 nm. The thin film solar cells structured as FTO/CFTS/CdS/Al are...
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